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Timestrips® are single-use, disposable, smart-labels, which automatically monitor lapsed time, ranging from under 1 day to 6 months.

The technology behind the revolutionary Timestrip® works by capillary action, allowing a tinted liquid to migrate through a micro-porous material at a consistent rate.

It definitely sounds neat. I'd actually be able to estimate how long that BBQ sauce has been in the refrigerator without consulting my past social schedule. ("Let's see, did we make that before or after Grace was here?")